They aren't really clamped they are
compressed.
This is what film does, also. Film as a "toe" and "knee" region, which is what this curve emulates.
The default is just something "camera-ish" looking.
If you set highlights to 1 and shadows to 0, you have a completely linear curve (prior to gamma correction). If you do this you will see that highlights blow out much quicker, which could be a look you may want for a "contrasty" result, but is often undesirable and very "video" looking. (Actually to make it completely "video" looking you need to add ringing to overbrights, "sharpening" they call it in video, but that's a digression).
BTW: I do indeed suggest to turn on Vignetting to 4.0 as a good default. I'm a bit sad someone (that was not me) chose to default it to 0.0, since actually a real camera by nature always has some vignetting (the only way to completely remove it in a physical camera would be to have a ND filter that is darker in the center to compensate... )
According to Wikipedia the
Natural Vignetting of a camera is the 4:th power of the cosine of the light angle against the film plane, and it so happens that the "vignetting" parameter
is the power of the cosine of the ray angle to the film plane....
/Z
Quote:
Originally Posted by robkar97
I'm not really having any problems with this, I'm just curious!
I find the "mr photographic exposure control" is quite nice and I think it does a great job making balanced renderings.
However, I wonder why the highlight default is 0,2? Doesn't this mean the highlights are clamped? I mean, if the S-shaped graph is anything like a histogram, doesn't that mean that you loose detail in the brightest areas?
Just a thought...
Robert
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